   * { 
      margin: 0; padding: 0;
      font-size: 16px;
   }
   fieldset,img {
      border: 0;
   }
   img {
      display: block
   }
   ul,ol {
      list-style: none
   }
   video {
      width: 100%;
      font-size: 0;
      outline-width:0px;  
      vertical-align:top;
   }
   video::-webkit-media-controls-fullscreen-button {
      display: none;
   }
   .back {
      position: relative;
   }
   .back img {
      width: 100%;
      font-size: 0;
   }
   .btn {
      width: 44%;
      height: 50px;
      background: #eda732;
      position: fixed;
      bottom: 1%;
      left: 0%;
      right: 0;
      margin-left: auto;
      margin-right: auto;
      border-radius: 4px;
      color: #1c1a1a;
      font-size: 20px;
      line-height: 50px;
      text-align: center;
   }